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Commitments and Contingencies - Additional Information (Detail) £ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Jun. 30, 2016 GBP (£) | Dec. 31, 2011 USD ($) Hospital | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Nov. 30, 2010 USD ($) | Nov. 30, 2010 GBP (£)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability |  |  |  | $ 215,000,000 | $ 204,000,000 |  |  |  |
Self-insured for professional and general liability, current |  |  |  | 48,000,000 | 48,000,000 |  |  |  |
Compensation liability claims |  |  |  | 68,000,000 | 68,000,000 |  |  |  |
Compensation and related benefits |  |  |  | 34,000,000 | 34,000,000 |  |  |  |
Accounts receivable, net |  |  |  | 1,344,916,000 | 1,302,429,000 |  |  |  |
Payment suspension period increased | 180 days |  |  |  |  |  |  |  |
Letters of Credit and Surety Bonds |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Off-balance sheet contingent obligation |  |  |  | 130,000,000 |  |  |  |  |
Self Insurance Programs | Letters of Credit and Surety Bonds |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Off-balance sheet contingent obligation |  |  |  | 105,000,000 |  |  |  |  |
Other Debt Guarantees | Letters of Credit and Surety Bonds |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Off-balance sheet contingent obligation |  |  |  | 25,000,000 |  |  |  |  |
Location 1 |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Minimum Insurance Deductible |  |  |  | 50,000 |  |  |  |  |
Location 2 |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Minimum Insurance Deductible |  |  |  | 250,000 |  |  |  |  |
Illinois |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  | 24,000,000 | 28,000,000 |  |  |  |
Accounts receivable net greater than sixty days Past due |  |  |  | 9,000,000 | 12,000,000 |  |  |  |
Texas |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  | 38,000,000 | 80,000,000 |  |  |  |
Texas | Uncompensated Care Program and Disproportionate Share Hospital |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  | 22,000,000 |  |  |  |  |
Texas | Delivery System Reform Incentive Pool |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  | 16,000,000 |  |  |  |  |
Flood | Location 1 |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Maximum insurance deductible |  |  |  | 500,000 |  |  |  |  |
Flood | Location 2 |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Maximum insurance deductible |  |  |  | 250,000 |  |  |  |  |
Cygnet Health Care Limited |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Property insurance | £ |  | £ 180 |  |  |  |  |  |  |
Maximum | Wind Storms |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  |  |  | $ 1,000,000,000 |  |  |  |  |
Percentage of insurance deductible |  |  |  | 5.00% |  |  |  |  |
Maximum | Earthquake | LAS VEGAS, NEVADA |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  |  |  | $ 500,000,000 |  |  |  |  |
Maximum | Earthquake | CALIFORNIA |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  |  |  | 130,000,000 |  |  |  |  |
Maximum | Earthquake | UNITED STATES |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  |  |  | 100,000,000 |  |  |  |  |
Maximum | Earthquake | PUERTO RICO |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  |  |  | 40,000,000 |  |  |  |  |
Maximum | Earthquake | OTHER STATES |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  |  |  | $ 250,000,000 |  |  |  |  |
Minimum | Wind Storms |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Percentage of insurance deductible |  |  |  | 3.00% |  |  |  |  |
Professional Liability | Cygnet Health Care Limited |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability | £ |  |  |  |  |  |  |  |  | £ 10
General Liability | Cygnet Health Care Limited |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability | £ |  |  |  |  |  |  |  |  | £ 25
Subsidiaries | Professional Liability | Maximum |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability |  |  |  |  |  |  |  | $ 10,000,000 |
Subsidiaries | General Liability | Maximum |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability |  |  |  |  |  |  |  | $ 3,000,000 |
Subsidiaries | General And Professional Liability Insurance Policies |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Percentage of liability for claims paid under commercially insured coverage |  |  |  | 10.00% |  |  |  |  |
Subsidiaries | General And Professional Liability Insurance Policies | Maximum |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Purchased several excess policies through commercial insurance carriers per occurrence |  |  |  |  | $ 250,000,000 | $ 250,000,000 | $ 200,000,000 |  |
Liability for claims paid under commercially insured coverage |  |  |  | $ 60,000,000 |  |  |  |  |
Subsidiaries | General And Professional Liability Insurance Policies | Minimum |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Liability for claims paid under commercially insured coverage |  |  |  | $ 10,000,000 |  |  |  |  |
DPW |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Repayment of legal settlement amount on demand |  |  | $ 4,000,000 |  |  |  |  |  |
Percentage of federal share on payments |  |  | 55.00% |  |  |  |  |  |
DPW | Pennsylvania |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Number of behavioral health care hospitals | Hospital |  |  | 7 |  |  |  |  |  |

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